Sets the texture used to mask the shape of the minimap. White areas in the texture define where the dynamically drawn minimap is visible. The default mask (Textures\\MinimapMask) is circular; a texture image consisting of an all-white square will result in a square minimap.
Signature:
Minimap:SetMaskTexture("filename")
Arguments:
filename- Path to a texture used to mask the shape of the minimap (string)